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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2da125830c43a2c27b6b5cda71cb816dd690326e68a466ab0d06e6d930245b5' 
  AND token = 'DoUP5QKiiCDrtbzx6arcBc4v3Mcc5lB8hB5eDjyZ+Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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