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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c29bb3daad9462a110a9a1c0f2ac592e32661012317377f213b0713eb884974' 
  AND token = 'tcMMzZtax7bpb+sd3dbZb0LacZ8kn7Yxr9bgWOGy9zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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