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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82ad2c94d7f012b0ff79620da6c9d7ffafec29fe6d7743ad6ec2b8660f806af' 
  AND token = '5Np/9YZEK5uZnD852JXbGtk+hcLMQP9JEEduVxzARa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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