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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eeb68ba960a8a7fd5bef69275c2ad32342ee077e78dde94dd05db6b467ff83' 
  AND token = '/GEviKeNS8BOCrtK3oUur7I2qKiv6k+oSVUnDPpDqhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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