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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f32d68126c2ebed9bda09bcf31888c04285365f6089b26bd67ba7f56d6cc23' 
  AND token = '2LZLoTgENzi0jErQSeCepcVY/B+82R+gx5lFEIJnKvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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