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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b955c6bdd37f82beb6d1e0604899a1cec23c85a8a552b37a83fa50afbc96fc45' 
  AND token = 'IYBQUxdit6i1p9049nvKyaZ5cXue7cnvi7i0r5xJFgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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