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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f899b6921454e7c9764c16f9fafac2dcbecd983a384a7d7471b8127301db2487' 
  AND token = 'BNUDQXFHvgb0f4J16l+qy0kai1D9SyAIQSNwZc1saz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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