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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62234f904d7a528b26810a793351836cf6ba215f1d80ca108361382094a13657' 
  AND token = 'Xos5nb96QmH6iObRtVJlwt13gJ+hsqWu1REi8C3+Fi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}