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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfff7f08610717415548bc2a307885b126fc5c90b9e2c798cc8cc5cdac77221a' 
  AND token = '6oiaDzB2fzg8Ay/6CGYQBH/ipMHKzuLIdsZobCpAF4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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