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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acec0364b4b07dc14f82a6983eedeedc5f7ac45e199a5152415bc1da25fee83d' 
  AND token = '+Sk3jNvq66hbs/T52HVoSsHd4EYOTwRKqIoMCNqH2uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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