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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b012cae84e941f2fd509a79407ff26df118c0d11c64e100488bd90b073a4612' 
  AND token = 'je32br2THkl/5N10Qe7qswXzenkeMMHWc89WSCYiJA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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