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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ab6537088375119826d72c652882bd8364ad500690d59fc50e9129f075ff13' 
  AND token = 'iva5W0ZAwbbjcrl36TF8RESkWvwdbkqrDATRfd7KQ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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