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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09eed2dabb12bedaf11793a5618ab9862f4aa41731f99a1a21fc0e7c5c0b0c38' 
  AND token = 'rn8ik4giu0TxnkcKpRuG0uJ1U1BzXbZgNfMWShM/1s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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