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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1815a6f44a7986f7787d3e4aea9ebe04913703dba3712c40882929d46f2597d3' 
  AND token = 'hDl+q1Cr6zWBcLiU15Szt4qFaH3QT38cUKP25puKdL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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