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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b8290b9932faadabec1bf71a12cefd9aa53c442d8690fd50645984818abc33' 
  AND token = 'Q9Q7TMx8XFJQv2jOevB98J+6U7/OprqF+O19KxAjpEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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