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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ba8abc2d42dd55067fb32d3087e146a74afc5a2c2a498e37055034f92fe55c' 
  AND token = 'S7Sv7NFj2BvHeR20I0AWa86VYRBxL1VynoVlFj6zrlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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