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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfa87991f7093f627f8cc6ccacfbcce3c8dd68cd6474c30677bf1806cde1045' 
  AND token = 'oSt3E81wLTDfGVlKwWYRJVWgIq+P3ntxlNBl+pmiTjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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