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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d0f0707514d08610e040a01b7077b375ef5e589875eee8e4198272af6ceb2c' 
  AND token = 'ChoO5FMF7Go6YiL9ctKuSEK0FcZKbpA9NyxF1DjDYX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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