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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7298c0265d1b1c0e6c73b78fd1923e943fccd49280700d043b29eaa0f48a02f6' 
  AND token = 'MOSkee4dy/2ft4OqESqCEp8Il0ryPRJPHxEnQHRmsM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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