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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d638dfc8ce46c4d568646677e9bcd778efd9f265b0fbec6f3be73c1ca751aad' 
  AND token = 'l0Wv+4+f88lGUPf3fvTWRIGNHP1bw3z3p2pEiuftxw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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