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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8c202385da94e09b82dd7c2c73449446977d7e49f49629e0e3d2dfe24bb7ab' 
  AND token = 'Cv+tvnEsXAn71BQX9ncDkdfgDf/cKeUUc5rXCoJhRO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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