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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0954773d3e7f40d0a670b248cd188a13c0a0295d52780ee6603b722eb86984' 
  AND token = 'fIk/nsF/ptHoDiQ5u42gvKZ/GffzkvT3kzgeuJz7nv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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