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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cb07d8209f95461e64eeef9d0ac6e965baaacbdf9d938b6a62b27286087d45' 
  AND token = 'mVROW+Br0d1Fd0FZ1ZkJIwcurPAZJqs4G7dHa5ldkIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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