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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dd5d5e165c2ed1140f1bf8d017b99ac6261e98ccf43aa3acd782d804b9ef6b' 
  AND token = '61KrD4BwEF+TZkq6tpiX1l6KtNJOmYNkPl+14C2kifA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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