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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1e3fae09584eaea67a9bfe34f016d7d1ee1d4c5afc831626f07d394de7ca74' 
  AND token = 'efSx6B5MtN4QFaUjG7QhOvE2GnOyAXPn24L2AFS19Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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