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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc75e4f45bec39e4618ada43da3462400c66b19c2a7f219b3bea820f6a3e62b' 
  AND token = 'OcXxToCihAeB5ZDvTxyzLCOw/85oZl4/3qc8Q8aDizc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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