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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1076e6252caf541f9a7c9a4c25d03a2da032ae963fd6b176cfd8618ae62cc8' 
  AND token = 'BjFuMZttwcZ9qeRZbTet0zeLYU3jI8PdNBsa3PU+wco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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