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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29cecc4f414d2db12d44575faffda37af44b4b57c7698470a72ec61de462f5c' 
  AND token = 'BTRA63oC0VzFL4BU43zF660Ax4JNeeHr9S0yby39ocw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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