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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3694625de15e5a6ade59a3bc45e8304734c722fb8c6af0c5c92e5b8c3fba181' 
  AND token = 'zWUTWMMT20+bVKPccdqS1pobx022onzonGNtBNkTO1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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