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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e4e378defbcde0f86dfb11601d878692b18c0f83b8a1921390e4108a4ccb9b' 
  AND token = 'FaFNPe5PafQEhDbOGdqJAeVB/fs0vToK7pYIYGwY41o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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