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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2f4796240e6b4584ea5f7f0b489fb08ffa5599e5b38533ae237b98ec5fe86e' 
  AND token = 'lz21ivKZSGddnOjP9LsPMCr8/T71ScwI1sJxIklbOtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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