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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655d5129e7e29b383e58d19f11e0109b07e5692fbb36e295b6f319c2a82ea3cb' 
  AND token = 'KCoCd7V2lN/8ZUyfDCDSx7sWzincJ3AAWcrEGCTq73Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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