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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fb25d65192d7933b51583c7304c10d80a491bc9b5e0bc153bdddc7c55b408e' 
  AND token = 'da6BLuggWhRhyolzp+SNBP19k3ioJV1glz7f/EAe7F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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