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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7e9f02d3a54ac38575807217ecc9672e4e0c8416695bd22f2f7512a030fc73' 
  AND token = '8KEcsptURCPPN98hsCNadudUDeSWGJ5w8WAixXZ+Lew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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