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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d35b2e976bed5ced676ec262e0d03f9e692d0ffec0c1c4c3e582877f777533c' 
  AND token = 'ROX9PehOreYiavN7yNWc6C+FMyO3kNPTqwml4OACZUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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