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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9b0162a396d49f8049f8985977f14de99ee8044acd3edc430cce4653b7fd5c' 
  AND token = 'dQLSurCcluL3ZccvvSvL0r9i34BB09n5Mhlk+Cp2Nok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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