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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76680392898d60a4d316256ec618b221d06ffd5289c9371198387474f6e1bd2a' 
  AND token = '1lzB5BHzAGPPeObN3fHC0zMj1VBEJ92zdqVbqQhzFVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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