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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548653878471debd3bf82c653eb9e2daf47cc47c27bc1d95a11fc00c838fc4f4' 
  AND token = 'x5P3PAeFyimIT8cJjzhupUnHmpU8I97K/ufLp8ChBkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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