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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9aebf5767b54ea28fcafde8e95befea81c214ed2e09f4ccafed8d35d1ce5ad1' 
  AND token = 'EG8byR+yOx6J8vswk/FyoxNX7oHc1UdjSu49QmDa2zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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