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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793b99fc6b750ac7b85727ee224d01d00d698cc2cb2a8dce5396fe5d45bff571' 
  AND token = 'VUNhmc2TXNmH8BsYCXQZJdR92KcV7g1xg4tNH0UwK24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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