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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539eb929b7f81edf21d6d5f9c2066ea7e572af2224257a0c8361a77d60643bf4' 
  AND token = '/KnNS92kOK5doERbDxaqcimlEZFg9JjWCynGdcuSIgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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