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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9941ee1e498495f3729f81061f11184c7a2a1164355c9f763a94a7e623a8535b' 
  AND token = 'r9GLMNG9qhkfW2ygmeEEVABWwPe95WwUgk51SjRwmbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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