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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626e0fb21ff22e3b3166667b75612102d504348787145dc819c045689798b335' 
  AND token = 'A6zx75VS4Yx4Z8cpTHhWCtS4r0+Og7Q1gOL4FyE2vtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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