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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c268addd033f7decfef9b86412821dcc524fe824da2c669155bb97f99e70a67' 
  AND token = 'dnbM21wPHd7FHnsDy58nPk9I2Xxh1/iPoHRPWWD6NK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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