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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11913a194e897da7db1d1928d108116ea67be79677577e9bd478f4882e20e1e2' 
  AND token = 'OyroJ7rTM/+N1lc9NtKyBJGFksaK/hIyesnakQoG4jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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