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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce3e9404d0b8bcee002539f2fcecc520734a7938956bd9d48a0673588d6b224' 
  AND token = 'U2rywvsevbLf4eMgVhfIC5xdJHPMzXX7llN8IgDKnZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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