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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5259211dfffca4f2a4e4944ea636e57b5db5f20e63b31011b51f314e00014164' 
  AND token = 'LfMIFK9NAfwGDHIANNQX67ZvHCFOOWygi1wcZXKrTZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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