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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5104af50fea3224aae6ae5e0fa82580a11d19bd75f2c849c620b0e5f08639a3b' 
  AND token = 'ssbJRQqhmFnV/ohM+80InY0j98G56eG3r7vOGL6FgcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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