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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5465be8651fcf0a931904373da45e61303906e5d7403b4ae5b5bb987cc04d1e9' 
  AND token = 'fz6Fik09oa01pT41hHus8li3+5WgdERlsb4yEWuyISo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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