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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba28f65fe23ab3be920a63b0b278f68dc8a4af73621aa392c7488ed381b1099' 
  AND token = 'f5br7Tcy7zakNPWPTL3YUqVL9jjMATfk3vs94J8dpos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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