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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88a974673faeb0c2fe0b0abb0994cc4651e9248a2889a62a13c51073bfc0f18' 
  AND token = 'in+CrtFW1AQbJJ95jWv1jYpoJZ0qN+yXM1gmEHDPXGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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