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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d47d3aced3afc3e0e9b4762ab2d59bcc9ceb6a1b12209149aae5aaa4c5bdea' 
  AND token = 'WOB+pAJNUot2v9emA9AGpdRHgJ8Bdu4bBw9XFNk5uKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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