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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c48fcc4c5a4b1025a31865da8d83398d790baefca1bd0b19eb7fccbb5e9faf' 
  AND token = 'vEtjmrTZ206xQXaWZeLssWa8mjO4682NoBXeukkop2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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