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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8d16bc92168593745dfafbb8776ac814872e0f6294d211eb344c7574e4b635' 
  AND token = '+SIMyZAEHWER2hihjo8RlqEYFbfi8+a6s2mo2nKSb1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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