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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36fee4fda50899c7a9d9e4840f25e4d0e1b535d02de16f53c605175cd5569e8' 
  AND token = 'NT5w98d25Xwfvxk3Dq5rDbukiQ3G5US7gvfVsDxTmiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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