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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f44d5f59fe0790bc6d1b50824202bdf84ded219dca997c6d3d74c988d3ef8ae' 
  AND token = '8yaqiAB42rXx4pozz1A2axvDgZ8U5ING+7kHdSWejWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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